Question

Cow dung and water is mixed and this slurry is fed into the biogas plant for digestion by microbes. The person performing the process shares that there is no need to provide any inoculum for it. Give reason. What is the role of microbes at the source? Under which condition will they be most active and effectiv?

class 12th CBSE Biology sample paper

Answer 1

Bacteria utilize carbon as a source of energy (to keep on eating) and nitrogen to build protein in their bodies (so they can grow and reproduce). ... They are most active at 55° F and will work in the pile if the initial pile temperature is less than 70º F. They give off a small amount of heat in comparison to other types of bacteria.

Answer 2

The person performing the process shares that there is no need to provide any inoculum in it because Methanogens are present in Cow dung so there is need to add inoculum.

The role of microbes at the source is Breaking down of cellulose present in the cow dung.

Under Anaerobic condition they will be most active and effective.